Siren



June 25, 1929. T. E. BRALEY SIREN v 2 Sheets$heet Filed Oct. 1926 I I h INVENTOR. fl fifnessr I MW A TTORNEY.

June 25, 1929. E BRALEY 1.718.405

SIREN Filed Oct. 1926 2 Sneets-shpet 2 INVENTOR.

Patented June 25, 1929.

UNITED STATES THOMAS E. 0]? WICHITA, KANSAS.

SIREN.

Application filed October 2, 1926.

My invention relates to improvements in sirens. It is adapted for use on automobiles, air planes and air ships, and is of the type in which a revolving member is provided with blades which produce sound by forcing air through peripheral openings in a casing in which the member is mounted.

One of the objects of my invention is to provide a novelsiren of the'kind described, which is simple, cheap, durable, not liable to get out of order, and which is reliable in its operation.

A further object of my invention is to provide a siren which in operation will simultaneously produce two sounds of different tones.

My invention provides further a novel construction which permits of the rotation of the revolving member vin either direction and to produce like signals when revolved either way, whereb the siren can be adapted to different conditions of the power mechanism which rotated the revolving member.

My invention further provides a novel mechanism for holding the revolving member from rotation by the propelling power, when it is not desired to have the siren sound signals.

' The novel features of my invention are hereinafter fully described and claimed.

In the accompanying drawings, which illustrate the preferred embodiment of my invention,

Fig. 1 is a side elevation, partly broken away, of my improved siren.

Fig. 2 is afront elevation of the same.

Fig. 3 is a rear elevation of the same.

Fig. 4 is a section on the line 4-4 Fi 1.

Fig. 5 is a section on the line 55 Fi .2.

ig. 6 is ,a section on the line 6-6 Fi .1. r

Fig. 7 is a side elevation of the revolving member.

Similar reference characters designate similar parts in the different views.

The siren has a casing-body 1 having at its front end a removable cover 2 fastened toit by screws 3, or other suitable securing means. The casing has a circular chamber having at its rear end an air inlet comprising openings 4, the cover 2 having an air inlet comprising openings 5.

Thebody 1 of the casing has two sets of circularly arranged peripheral holes 6' and Serial No. 139,115.

7, there being in the form shown 8 holes 6 and nine holes 7. In order that two different deep tones or sounds may be simultaneously produced, the numbers of holes of the two sets 6 and 7 must not have a common divisor. For exam le, if the holes 6 number eight, the holes 7 should not number six or ten, or have any number having a common divisor with number eight, otherwise there will be no simultaneous production of different tones.

A horizontal shaft 8 is rotatable in ball bearings 9, mounted one bearing in the rear end of the body 1 and one bearing in the cover 2, Fig. 5.

Secured rigidly to the shaft 8, as by a set screw 9, is a revoluble member 10, which is rotatable in the casing, and which is provided with a partition 11 transverse to the axis of themember 10, and which'is'located between the openings 4 and 5, and between the two sets of outlets 6 and 7.

Extending radially from the hub of the member 10 at opposite sides of and joined to the partition 11 are two sets of T shaped blades 12 and 13, there being nine'blades in the set 13 at the front side of the partition 11, and eight blades in the set 12 at the rear side of the partition. The blades of each set are equally spaced and number the same as the peripheral outlet holes with which they co-operate, and through which they drive air taken into the casing at the adjacent inlet holes. The transverse head ortion 15 of each of the blades 12 and 13, extends at equal distances at opposite sides of the radial portion of the blade and is of a width such that it will cover any of the air outlet holes with which it co-operates. By having the two circular portions of the body 1, respectivel containing the outlet holes 6 and 7, of di erent diameters, the one of smaller diameter being the one. having the larger number of discharge openings, the difl'erence in pitch of the two deep tones produced will be still further accentuated.

Each head portion 15 has in its outer side a transverse groove 16, with which communicate the outer ends of two holes 17 that extend through the head to the inner side thereof and to opposite sides respectivel of the radial portion of the blade. ese grooves 16 and holes 17, together with the difference in diameter of the two circular portions of the body 1, enables the production of two difierent shrill tones.

When the member 10 is rotated in the easing the head portion of the blades 12 and 13 will each consecutively cover and uncover the outlet holes with which it co-operates, and a pleasing and characteristic signal having two different deep tones commingling 8'toalford the driving power therefor.

If the device is used on an automobile, it

may be connected with some rotary part of the machine,'as the fan .drivin shaft, by a belt and pulley, not shown, or other suitable transmission mechanism.

In "order that the'member 10 may be held from rotation, excepting when it is desired to operate the siren, I provide a brake block 19 which is reciprocative in a hole 20 in the body 1, and which has a stem 21 slidable in Y a hole through the cover 2 and a cylindrical extension 22 on the front side of the cover 2. The rear end of the brake shoe or block 19 is normally held with suflicient pressure against the partition 11 to hold the latter from revolving, by a coil spring23, which at its rear end bears on the partition 11 and at its front end against the cover 2. I

To withdraw the shoe 1.9 from holding engagement with the partition 11, the stem 21 has'fastened to it a flexible member, such asa cord or wire cable 24, which passes over a grooved pulley 25 rotatably mounted on a bracket 26, which has two arms 27 embracing the projection or extension 22. The bracket 26 may be circumferentially adjusted on theprojection 22 and then held in its adjusted position by tightening a nut 28, Fig. 2, on a bolt 29, which extends through the arms 27. By utilizing an operating member,

such as the cable 24 attached to the stem 21 of the brake shoe, the pressure of the.

latter against the partition 11 may be varied without entirely releasing the brake shoe.

In the operation of the siren, when the shaft 8 is rotated and with it the member 10 the air will be drawn into the casing through the openings 4 and 5, and discharged by the blades 12 and 13 through the openings M 6 and 7 respectively, two tones being made at the same time, when the member 10 is retated with the rapidity required for its successful operation.

' It" .will be noted that the grooves 16 in I the outer sides of the head portions 15 of the bladesdo not extend to the full'width of the head p0rtions,.but only to the edges distant from the partition, thus preventing hole 30 which is intersected by a vertical groove 31- adapted to receive a pin, not

shown in said supporting bar.

I do not limit my invention to the structure shown and described, as many modifications, within the scope of the appended claims, may be made without'departing from the spirit of my inventionl What I claim is V 1. In a siren of the kind described, a casing having an air inlet and circularly'arranged air outlets, an air driving member rotatable in said casing and'pro'vided with circularlyarranged blades each having a head portion which, on the rotation of said member, consecutively covers and uncovers said air outlets, eachof said head portions having an air passage therethrough extending from the inner sideof the head portion at one side of the blade to the'outer side of said head portion and disposed so as to consecui'ively communicate with said outlets, and means for supporting and rotating said member.

i 2. In a siren of the kind described, a casing having an air inlet and circularly arranged air outlets, an air driving member rota-table in said casing and provided with circularly"arranged blades, each having a head portion which, on the rotation of said member, consecutively covers and uncovers said outlets, each ofsaid head portions having on its outer side a transverse groove, each head portion having an air passage extending therethrough from the inner side thereof to said groove in said head portion, and means for supporting and rotating said member. y

3. In a siren of the kind described, a casing having an air inlet and circularly arranged air outlets, an 'air driving member rotatable in said casing and having circularly arranged T shaped bladesgthe transverse head portion of each of said blades, on the rotation of'said member, consecutively covering and uncovering said outlets, each of said head portions having two air passages extending .therethrough from the inner side thereof at opposite sides respectively of said blade to the outer side of said head portion, and means for supporting and rotating said member. 4 v

1. In a siren ofthe kinddescribed, a cas ing havingan air I inlet and circularly arranged air outlets, an air driving member rotatable in mana ing and having circularly arranged T shaped blades, the transverse head portion of each of said blades, on the rotation of said member, consecutively covering and uncovering said outlets, each head portion on its outer side having a transverse groove, each of said head portions having therethrough two air passages extending from opposite sides respectively of the blade to said groove, and means for supporting and rotating said member.

5. In a siren of the kind described, a casing having an air inlet and circularly arranged air outlets, an air driving member rotatable in said casing and having means, when rotated for driving air through 'said outlets, said member having an extension provided with a hole therethrough, means for supporting and rotating said member, a brake shoe reeiprocative in said hole and adapted to bear against and hold said mem her from rotating, means for normally forc ing said brake shoe into holding engagementwith said member, a bracket circumferentially adjustable on said extension, a pulley rotatable on said bracket, and a flexible operating member attached to said brake shoe and engaging said pulley and adapted when pulled to withdraw said brake shoe from holding engagement with said member.

6. In a siren of the kind described, a casing having two air inlets and two sets oi circularly arranged air outlets, the numbers of said outlets in said two sets not having a common divisor, an air driving member rotatable in said casing and having a partition transverse to its axis between said sets, and at opposite sides of said partition having respectively two sets of blades adapted, when the member is rotated to respectively force air through said two sets of outlets, each set of blades and the set of outlets with which they co-operate being spaced equally apart and having like numbers, and means for supporting and rotating said member.

7. In a siren of the kind described, a casing having two air inlets and two sets of circularly arranged air outlets, the numbers of said outlets in said two sets not having a common divisor, an air driving member rotatable in said casing and having a partition transverse to its axis between said inlets and between said two sets of outlets, and at opposite sides of said partition being provided respectively with two sets of blades, adapted when said member is rotated to respectively force air through said two sets of outlets, each of said sets of blades and the set of outlets with which it co-operates having a like number and equally spaced, each of said blades having at its outer end a transverse portion adapted to consecutively cover and uncover the adjacent outlets, when said member is rotated, and means for supporting and rotating said member.

8. In a siren of the kind described, a casing having two circular portions of different diameters and having respectively two sets of circularly arranged equally spaced air outlets, the numbers of said outlets in said two sets not having a common divisor, and a,

rotary air driving member in said casing having two sets of blades respectively cooperating with said two sets of outlets and having respectively like numbers and being equally spaced, said member having a partition transverse to its axis intermediate of said two sets of blades.

9. In a siren of the kind described, a casing having an air inlet and air outlets, an air driving member rotatable in said casing having means for driving air through said outlets, a brake shoe, means for automatically forcing said shoe against said air driving member, a pulley on said casing, and a flexible operating member having running engagrment with said pulley and attached to said shoe for retracting the shoe from said driving member.

10. In a siren of the kind described, a casing, a pulley, means eireumferentially adjustable on said casing and supporting said pulley, an air driving member rotatable in said casing, a brake shoe, means for automatically forcing said brake shoe against said air driving member, and a flexible member having running engagement with said pulley and attached to and arranged to retract said shoe from said driving member.

11. In a siren of the kind described, a casing having two sets of peripheral air outlets, the numbers of said two sets not having a common divisor, and a rotary member in said casing having two sets of blades arranged to respectively cooperate with said two sets of outlets to force air therethrough, to produce two tones not in harmony with each other, but which combined effect a discordant sound.

12. In a siren of the kind described, a casing having two sets of air passages not having acommon divisor, and means for forcing air through said passages so as to produce two tones which do not harmonize.

In testimony whereof I have signed my name to this specification.

THOMAS E. BRALEY. 

